Reenforced-concrete pipe



Patented fipr. l5, 122@ j stars PAUL KRCHTJR, OF CHICAGO, ILLINOIS,ASSIGNOR TO MASSEY CONC/RETE PRODUCTS CGRPORATON, GF CHGAGC, ELLINO'S,CORPGRATION 0F VIBGNIA.

BEENFQBJCEDMONCEETE PEPE.

Original application led July 14, 1921, Serial No. L84,556. Divided andthis application filed March 20, 1922. Serial No. 545,056.

To all whom it may concern.'

Be it known that l, PAUL KIRCHER, a citizen of the United States, andresident of Chicago, in the county of Cook and State of illinois, haveinvented a certain new and useful Improvement in Reenforced-ConcretePipes, of which the following is a full, clear, concise, and exactdescription, reference being had to the accompanying drawings,

l@ forming a part of this specification.

This invention relates to a reenforced concrete pipe, and particularlyto concrete pipes suitable for use in railway culverts and for Y otherpurposes which require that the pipe l5 be capable of withstandingsevere forces transmitted thereto in lines substantially at right anglesto the longitudinal axis of the p lit is the object of this invention toprovide a pipe which will comprise a minimum amount of concrete andreinforcing material in its construction but which, nevertheless, iscapable of resisting the severe strains to which it may be subjected.

Prior to applicants invention disclosed in his application, Serial No.484,556, filed July 14, 1921, of which the present application is adivision, the most successful type of railway culvert pipes had beenconstructed in accordance with the teachings of United States PatentNumber 7 09,7 94. The present invention, as set forth in applicantsprior application, retains all the advantages of the above mentionedpatent, and, in addi- 2&5 tion, affords important advantages notheretofore attained in the construction of concrete pipe of the type towhich the present invention relates.

The present invention will best be underce stood from a detaileddescription taken in connection with the accompanying drawings, inwhichf Figure 1 is a transverse section of a reenforced pipe embodyingmy invention; ce Figure 2 is a longitudinal section through the pipe onthe line 2 2 of Figure 1, and

Figure 3 is a transverse section, similar to Figure 1, but showing aslightly modified form of the invention.

ne Referring to the drawings, at 10 is shown a concrete pipe which issubstantially annu-` lar in cross section. imbedded in the pipe is areinforcing cage 11 which consists of a strip of woven wire material aswire netting, the ends of which are caused to overlap and are preferablytied together to facilitate maintaining the cage in position in the pipeform. The cage 11 is elliptical in cross section and extends through thevarious regions of tension in the pipe. It is well known that when apipe, as shown in Figure 1, is subjected to vertical stresses, as whenused as a railway culvert, regions of tension occur at the top andbottom adjai cent to the inner surface of the pipe and at the sides ofthe pipe adjacent to the outer surface thereof. Thus, it will be notedthat the cage 11, as viewed in Figure 1, extends adjacent to the outersurface of the pipe 10 at the sides of the pipe and adjacent to theinner surface of the pipe 10 at the top and bottom thereof.

ln order to reduce the possibility of the cage 11 being torn out of theconcrete at the regions of tension where it is adjacent to the innersurface of the pipe, a pair of wire netting or wire fabric strips 12 and13 are provided, which are co-extensive longitudinally with the cage 11and are arranged substantially tangentially to and in engagement withthe cage at the point where it is nearest to the inner surface of thepipe.

rlhe reinforcing strips 12 and 13 are preferably secured to the cage 11by'being tied thereto, preferably by wire, as indicated at 14 and 15.The lateral edges of the strips 12 and 13 extend from the regions oftension adjacent the inner surface of the pipe at the top and bottomoutwardly into regions of compression. The anchoring of the reinforcingstrip edges in portions of the concrete removed from the regions ofinternal tension minimizes the possibility of the cage being pulled outof the concrete at the regions of internal tension when the pipe isforced to sustain a heavy load.

In Figure 3 is shown a modification of the arrangement shown in Figures1 and 2. In this modification, the lateral edges of the reinforcingstrips 12 and 13 are bent inwardly toward the cage 11 and are securedthereto as indicated at 16. Thus, the reinforcing strips are more firmlysecured to the cage by being tied thereto at aV greater number ofpoints.

While the wire netting reinforcing cage shown in the present applicationis more particularly adapted as a means for reinforc ing concrete pipeof relatively small diameter, still it may be used advantageously inreinforcing pipes of larger diameter if the netting or screen employedis made of wires of sutlicient size and strength.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is l. A reenforced pipecomprising a pipe body of initially plastic material, a substantiallyelliptical reinforcing cage imbedded in said pipe and having itsopposite ends overlapped, and separate reinforcing tension members insaid pipe adjacent and substantially tangential to said cage on oppositesides thereof. f

2. In a pipe comprising a body formed of initially plastic material, areinforcing cage imbedded in said pipe having its opposite endsoverlapped, said cage being positioned adjacent to the outer surface ofsaid pipe on oppositesides thereof and adjacent to the inner surface ofsaid pipe at points between said opposite point-spend separatereinforcing tension members adjacent and substantially tangential tosaid cage at the portions thereof which are adjacent to the innersurface of said pipe.

3. ln a pipe comprising-a body formed of initially plastic material, areinforcing cage of woven wire fabric imbedded in said pipe having itsopposite ends overlapped, said cage being positioned adjacent totheoutersurface of said pipe at substantially diametrically oppositesides thereof and adjacent to the yinner surface of said pipe at pointsbetween said opposite points, and separate reinforcing tension memberssubstantially longitudinally co-extensive with said cage adjacent andtangential to said cage at the portions thereof which are adjacent tothe inner surface of said pipe.

4t. In a pipe comprising a body formed of initially plastic material, areinforcing cage of woven wire fabric imbedded in said pipe having itsopposite ends overlapped, said cage being positioned adjacent to theouter surface of said pipe at diametrically opposite sides thereof andadjacent to the inner surface of said pipe at points midway between saidopposite points, and separate reinforcing members adjacent andtangential to said cage at the portions thereof which are adjacent tothe inner surface of said pipe and eX- tending outwardly from the cageto points l(['dijlacent to the outer surface of the pipe 5. As anarticle of manufacture, a. pipe body of initially plastic'materialreenforced by a cage of woven wire fabric having its opposite endsoverlapped, said cage being posi- `tioned adjacent to the outer surfaceof said Vpipe at diam'etrically opposite sides thereof and adjacent totheir-mer surface ofsaid pipe atk points between said opposite points,and

separate reinforcing members adjacent and tangential to said cage at theportions thereof which are adjacent to the inner surface of said pipe,the ends of said reinforcing members extending outside of the cagetoward the outer surface of the pipe body.

6. An article of manufacture comprising a pipe body of initially plasticmaterial, and a reinforcing cage imbedded in the pipe body and lyingadjacent to the outer surface of the pipe at substantially diametricallyopposite points and adjacent to the inner surface of the pipe at pointsintermediate said opposite points, said cage consisting of a singlestrip of woven wire fabric having its opposite ends overlapping, andtension mem bers associated with those portions of the cage which lieadjacent to the inner surface of the pipe and extending outwardly fromthe cage to points adjacent to the outer surface of the pipe body.

7. A reenforced concrete pipe comprising a substantially circular pipebody of initially plastic material having imbedded therein a reinforcingcage consisting of a single strip of wire fabric having its oppositeends overlapped, said cage being positioned adjacent to the outersurface of said pipe at substantially diametrically opposite points andadjacent to the inner surface of said pipe at points substantiallymidway between said opposite points, and tension members associated withsaid cage and extending outwardly from those portions of the cage whichlie adjacent to the inner surface of said pipe, said tension memberslying substantially tangential to the'cage, the outwardly extendingportions of said tension members being provided with offsets whichterminate near the outer surface of the cage.

8. A reenforced pipe comprising a pipe body of initially plasticmaterial, a substantially elliptical reinforcing cage imbedded in saidpipe having its opposite ends overlapped, and separate reinforcingtension members in said pipe adjacent and substantially tangential tosaid cage on opposite sides thereof, the edges of each of said tensionmembers extending outwardly toward the outer surface of said pipe bodyand being provided with offsets which terminate adjacent to said cage.

9. A reenforced concrete pipe comprising a pipe body of initiallyplastic material, a reinforcing cage of woven wire fabric imbedded insaid pipe having its opposite ends A overlapped, said cage beingpositioned adjacent -to the outer surface of said pipe on diametricallyopposite sides thereof and adjacent to the inner surface of said pipe atpoints substantially midway between said opposite points, and separatereinforcing tension members adjacent and tangential to said ,cage attheportions thereof which are adjacent to the inner surface of said pipe,

15 way between said opposite points, and reinforcing tension membersassociated with said cage and extending outwardly from those portions ofthe cage which lie adjacent to the inner surface of said pipe, saidtension members lying in lines substantially tangential to the cage, theoutwardly extending portions o said tension members be* ing rebent andterminating near the surface of said cage.

ln witness whereof, I hereunto subscribe my name this 17th day of March,1922.

PAUL KIRCHER. Witnesses:

EMILE J. BOURGEOIS, DAGMAR PETERSON.

